A Preliminary List of Levels and g-Values for the First Spectrum of Thorium (Th I)

摘要

The present state of the analysis of the first spectrum of thorium (Th I) is discussed briefly. Even and odd levels are listed in and . The low even levels form terms arising from the configurations 6d² 7s² and 6d³ 7s. The Th I standard wavelengths that fit into the known level arrays are presented in .>Table 1Even energy levels of Th I